Find out about peritoneal dialysis, what life is like while on it and the prognosis for those suffering from this condition. Learn how long a patient can be on peritoneal dialysis while awaiting kidney transplant.
Erasers are made from either natural or synthetic rubber. Natural rubber is produced from latex that is collected from rubber trees. Water is removed from the latex, increasing the rubber content to 60%. Acid is added to the liquid concentrate in order to produce solid sheets of dry rubber.
The pencils are next painted with five to eight coats of paint, and a recess is cut for the ferrule--the metal ring that holds the eraser. The ferrule and eraser are crimped into place, and a metal stamp is used to press a label onto the pencil. Various types of wood have been used to make pencils over the years. Red cedar from Kenya and the U.S. was an early favorite, but today nearly all pencils worldwide are made from incense cedar, a species that grows in California's Sierra Nevada Mountains.